*{
  margin: 0;
  padding: 0;
}
html,body,.App.wrap{
  width: 100%;
  height: 100%;
}
table{
  width: 70%;
  height: 500px;
}
table tr td{
  text-align: center;
 
}
button{
  width: 100px;
  height: 40px;
  outline: none;
  border: 0;
}
.active{
  background: royalblue;
  color: white;
}
.att{
  color: red;
}